"Riihimäen Lasi Lynx ashtray in complete and fine condition. Pictured on a red background, in order to show a better view, the object is therefore clear/white. Size 8cm x 8cm."

So not very illuminating!

It's a pity the photos of the two with stickers on are really blurry. Riihimäen Lasi did use a small circular gold foil embossed label at some point (I've one on a sun-vase) but it's impossible to judge either way.

I don't know how significant it is but Riihimäki did make sheet window glass. Lesley Jackson in C20th Factory Glass says they set up a subsidiary called Ikkuna Oy in 1939 to make window glass and they carried on making it until 1975.

I don't know how significant it is but Riihimäki did make sheet window glass.

Probably very significant. The first stage in slumped glass making: get your glass Although they would still need to set up transfer or (probably in this case) silk-screen printing, and then purchase the moulds, this should have been fairly straightforward as all the supplies were probably readily available.

It is possible they could have gone elsewhere, but less likely if they were actually producing the flat glass. I wonder if they ever moved onto making float glass though :?: